diff --git a/test/functional/assumevalid.py b/test/functional/assumevalid.py
index 8e301c4379..ed2a2cbc06 100755
--- a/test/functional/assumevalid.py
+++ b/test/functional/assumevalid.py
@@ -63,7 +63,7 @@ class AssumeValidTest(BitcoinTestFramework):
         # Start node0. We don't start the other nodes yet since
         # we need to pre-mine a block with an invalid transaction
         # signature so we can pass in the block hash as assumevalid.
-        self.nodes = [start_node(0, self.options.tmpdir)]
+        self.nodes = [start_node(0, self.options.tmpdir, ["-dip3params=9000:9000"])]
 
     def send_blocks_until_disconnected(self, node):
         """Keep sending blocks to the node until we're disconnected."""
@@ -163,14 +163,14 @@ class AssumeValidTest(BitcoinTestFramework):
 
         # Start node1 and node2 with assumevalid so they accept a block with a bad signature.
         self.nodes.append(start_node(1, self.options.tmpdir,
-                                     ["-assumevalid=" + hex(block102.sha256)]))
+                                     ["-assumevalid=" + hex(block102.sha256), "-dip3params=9000:9000"]))
         node1 = BaseNode()  # connects to node1
         connections.append(NodeConn('127.0.0.1', p2p_port(1), self.nodes[1], node1))
         node1.add_connection(connections[1])
         node1.wait_for_verack()
 
         self.nodes.append(start_node(2, self.options.tmpdir,
-                                     ["-assumevalid=" + hex(block102.sha256)]))
+                                     ["-assumevalid=" + hex(block102.sha256), "-dip3params=9000:9000"]))
         node2 = BaseNode()  # connects to node2
         connections.append(NodeConn('127.0.0.1', p2p_port(2), self.nodes[2], node2))
         node2.add_connection(connections[2])
diff --git a/test/functional/bip65-cltv-p2p.py b/test/functional/bip65-cltv-p2p.py
index 7a4f43280b..935b6522b6 100755
--- a/test/functional/bip65-cltv-p2p.py
+++ b/test/functional/bip65-cltv-p2p.py
@@ -38,7 +38,7 @@ class BIP65Test(ComparisonTestFramework):
     def __init__(self):
         super().__init__()
         self.num_nodes = 1
-        self.extra_args = [['-whitelist=127.0.0.1', '-blockversion=3']]
+        self.extra_args = [['-whitelist=127.0.0.1', '-blockversion=3', '-dip3params=9000:9000']]
 
     def run_test(self):
         test = TestManager(self, self.options.tmpdir)
diff --git a/test/functional/bip9-softforks.py b/test/functional/bip9-softforks.py
index da7d1efa5d..e5ec1b31ce 100755
--- a/test/functional/bip9-softforks.py
+++ b/test/functional/bip9-softforks.py
@@ -31,7 +31,7 @@ class BIP9SoftForksTest(ComparisonTestFramework):
     def __init__(self):
         super().__init__()
         self.num_nodes = 1
-        self.extra_args = [['-whitelist=127.0.0.1']]
+        self.extra_args = [['-whitelist=127.0.0.1', '-dip3params=9000:9000']]
 
     def run_test(self):
         self.test = TestManager(self, self.options.tmpdir)
diff --git a/test/functional/bipdersig-p2p.py b/test/functional/bipdersig-p2p.py
index b4b352dac6..450c483284 100755
--- a/test/functional/bipdersig-p2p.py
+++ b/test/functional/bipdersig-p2p.py
@@ -45,6 +45,7 @@ class BIP66Test(ComparisonTestFramework):
     def __init__(self):
         super().__init__()
         self.num_nodes = 1
+        self.extra_args = [['-dip3params=9000:9000']]
 
     def run_test(self):
         test = TestManager(self, self.options.tmpdir)